Driver and Terminal Source Codes

Hello,

I started using NiosII Embedded Evaluation Kit.

I've been writing codes for the fpga,

but started wondering what I should do with the pc software.

I know usb blaster driver and nios2-terminal.exe would do pretty much,

but want to know what's going on inside to make my own software.

Are there any sample codes available for those?

Any suggestion is appreciated!